The calendar may say December, but that doesn’t mean the weather has to follow suit. On Sunday and Monday, residents will see temperatures rising into the 50s and nearing 60, the National Weather Service says.

Most of the cold air today will sweep out tonight with a slight possibility of snow as temperatures drop to the low 20s, colder than normal for the last week of November, said meteorologist Bill Simpson of the National Weather Service of Taunton.

Precipitation in the greater Boston area will quickly turn to rain as Saturday warms up and temperatures reach a high of 42 degrees. The showers will stop by Saturday morning.

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Some rain showers will also appear Sunday morning, which will be an unusually warm day with a high near 56 degrees and nighttime lows in the 40s.

“We’ll have a bit of a warm spell,” Simpson said, adding that Monday’s high of 59 degrees defies the typical early December temperatures of 46 degrees or lower.

The temperatures are expected to begin to drop on Wednesday.

Simpson said he expected that after the warm front passes, we would start to see temperatures slip as we head toward the official start of winter.